The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 07, 2003
Filed:
Aug. 29, 2001
Rainer Perthold, Weisendorf, DE;
Gerald Ulbricht, Roethenbach, DE;
Heinz Gerhaeuser, Waischenfeld, DE;
Abstract
A circuit for pre-distorting an input signal v to be transmitted via a power amplifier having a non-linear transmission characteristic to produce a pre-distorted input signal y comprises an estimator ( ) for determining an estimation signal ( ) based on the power of said input signal v. A look-up table ( ) is provided for storing complex pre-distortion coefficients B and A which depend on the power of the input Signal v and the non-linear transmission characteristic of the power amplifier determined in advance. For B , the relation B =A −K, K being a constant with 0<K <2 applies, and A and A are the real and imaginary parts of a complex pre-distortion function which provides a pre-distortion of the input signal v such that the distortion introduced by the non-linear transmission characteristic of the power amplifier is substantially compensated according to magnitude and phase. Finally, a pre-distorter is provided in order to pre-distort the input signal according to y=v·(K+B +jA ).